First Gear

First gear





Gear rotation speed





^ Suppose the reduction ratio on the main shifting side is i1,





^ From the result NRF=0 in formula (1), the rotation speed of the front planetary gear unit can be calculated using the following formula:





Therefore,





^ Because the reduction ratio on the main shifting side is transmitted from the primary gear to the secondary gear, it can be calculated using the following formula:
The reduction ratio of the primary/secondary gear A = the number of primary gear teeth/the number of secondary gear teeth
Therefore,
A=82/86=0.9535
^ Suppose the reduction ratio on the sub-shifting side is ii1,





^ From the result NSS=0 in formula (1), the rotation speed of the secondary planetary gear unit can be calculated using the following formula.
(ZRS+ZSS)NCS=ZSSNRS
Therefore,
ii1,=NRS/NCS=(ZRS+ZSS)/ZRS=(89+31)/89=1.3483
And the reduction ratio of 1st gear= i1 x A x ii1, =2.8163 x 0.9535 x 1.3483=3.620
As a result, the reduction ratio of 1st gear is 3.620.